feat: implement restore nodes

plugin/gomark/ast/inline.go

@@ -1,5 +1,7 @@
 package ast
 
+import "fmt"
+
 type BaseInline struct {
 	BaseNode
 }
@@ -14,6 +16,10 @@ func (*Text) Type() NodeType {
 	return TextNode
 }
 
+func (n *Text) Restore() string {
+	return n.Content
+}
+
 type Bold struct {
 	BaseInline
 
@@ -26,6 +32,15 @@ func (*Bold) Type() NodeType {
 	return BoldNode
 }
 
+func (n *Bold) Restore() string {
+	symbol := n.Symbol + n.Symbol
+	children := ""
+	for _, child := range n.Children {
+		children += child.Restore()
+	}
+	return fmt.Sprintf("%s%s%s", symbol, children, symbol)
+}
+
 type Italic struct {
 	BaseInline
 
@@ -38,6 +53,10 @@ func (*Italic) Type() NodeType {
 	return ItalicNode
 }
 
+func (n *Italic) Restore() string {
+	return fmt.Sprintf("%s%s%s", n.Symbol, n.Content, n.Symbol)
+}
+
 type BoldItalic struct {
 	BaseInline
 
@@ -50,6 +69,11 @@ func (*BoldItalic) Type() NodeType {
 	return BoldItalicNode
 }
 
+func (n *BoldItalic) Restore() string {
+	symbol := n.Symbol + n.Symbol + n.Symbol
+	return fmt.Sprintf("%s%s%s", symbol, n.Content, symbol)
+}
+
 type Code struct {
 	BaseInline
 
@@ -60,6 +84,10 @@ func (*Code) Type() NodeType {
 	return CodeNode
 }
 
+func (n *Code) Restore() string {
+	return fmt.Sprintf("`%s`", n.Content)
+}
+
 type Image struct {
 	BaseInline
 
@@ -71,6 +99,10 @@ func (*Image) Type() NodeType {
 	return ImageNode
 }
 
+func (n *Image) Restore() string {
+	return fmt.Sprintf("![%s](%s)", n.AltText, n.URL)
+}
+
 type Link struct {
 	BaseInline
 
@@ -82,16 +114,28 @@ func (*Link) Type() NodeType {
 	return LinkNode
 }
 
+func (n *Link) Restore() string {
+	return fmt.Sprintf("[%s](%s)", n.Text, n.URL)
+}
+
 type AutoLink struct {
 	BaseInline
 
-	URL string
+	URL       string
+	IsRawText bool
 }
 
 func (*AutoLink) Type() NodeType {
 	return AutoLinkNode
 }
 
+func (n *AutoLink) Restore() string {
+	if n.IsRawText {
+		return n.URL
+	}
+	return fmt.Sprintf("<%s>", n.URL)
+}
+
 type Tag struct {
 	BaseInline
 
@@ -102,6 +146,10 @@ func (*Tag) Type() NodeType {
 	return TagNode
 }
 
+func (n *Tag) Restore() string {
+	return fmt.Sprintf("<%s>", n.Content)
+}
+
 type Strikethrough struct {
 	BaseInline
 
@@ -112,6 +160,10 @@ func (*Strikethrough) Type() NodeType {
 	return StrikethroughNode
 }
 
+func (n *Strikethrough) Restore() string {
+	return fmt.Sprintf("~~%s~~", n.Content)
+}
+
 type EscapingCharacter struct {
 	BaseInline
 
@@ -121,3 +173,7 @@ type EscapingCharacter struct {
 func (*EscapingCharacter) Type() NodeType {
 	return EscapingCharacterNode
 }
+
+func (n *EscapingCharacter) Restore() string {
+	return fmt.Sprintf("\\%s", n.Symbol)
+}